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Monthly climate in Koper, Slovenia

Last updated: May 6, 2024

Under the Köppen–Geiger climate classification Koper features a oceanic climate (Cfb).Temperatures typically range between 5 °C (41 °F) and 25 °C (77 °F) through the year, but rarely can drop to -7 °C (20 °F) or can rise to as high as 34 °C (94 °F).The average annual precipitation amounts to about 1308 mm (51.5 inches) and receives 119 rainy days on the 1 mm (0.04 inches) threshold annually.Koper enjoys an average of 3733 hours of sunshine throughout the year, and daylight varies from 8 hours 44 minutes to 15 hours 37 minutes per day.

Monthly average temperatures in Koper, Slovenia §

The warmest months in Koper are June, July and August, with daily mean temperatures ranging from 22 to 25 °C (72 - 77 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 5 to 7 °C (41 - 44 °F) throughout the day. On average each year, Koper experiences 74 days above 25 °C (77.0 °F) and 8 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Koper, Slovenia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to June 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Maximum 13°C
(56°F)		 19°C
(67°F)		 21°C
(70°F)		 25°C
(77°F)		 27°C
(81°F)		 33°C
(92°F)		 33°C
(91°F)		 34°C
(94°F)		 32°C
(90°F)		 23°C
(74°F)		 20°C
(68°F)		 15°C
(60°F)
Mean maximum 11°C
(53°F)		 15°C
(58°F)		 19°C
(66°F)		 22°C
(71°F)		 24°C
(76°F)		 29°C
(84°F)		 31°C
(89°F)		 33°C
(91°F)		 29°C
(84°F)		 22°C
(73°F)		 18°C
(64°F)		 14°C
(57°F)
Average high 8°C
(46°F)		 10°C
(50°F)		 12°C
(55°F)		 16°C
(61°F)		 20°C
(68°F)		 26°C
(79°F)		 28°C
(82°F)		 29°C
(84°F)		 24°C
(75°F)		 18°C
(65°F)		 13°C
(56°F)		 9°C
(49°F)
Daily mean 5°C
(41°F)		 7°C
(44°F)		 9°C
(48°F)		 13°C
(55°F)		 17°C
(63°F)		 22°C
(72°F)		 24°C
(75°F)		 25°C
(77°F)		 20°C
(68°F)		 15°C
(59°F)		 11°C
(52°F)		 7°C
(44°F)
Average low 2°C
(36°F)		 4°C
(39°F)		 5°C
(42°F)		 9°C
(49°F)		 14°C
(57°F)		 19°C
(66°F)		 20°C
(69°F)		 21°C
(70°F)		 16°C
(62°F)		 12°C
(54°F)		 8°C
(48°F)		 4°C
(40°F)
Mean minimum -1°C
(30°F)		 -1°C
(30°F)		 -0°C
(31°F)		 4°C
(39°F)		 9°C
(49°F)		 14°C
(57°F)		 17°C
(63°F)		 16°C
(61°F)		 11°C
(52°F)		 8°C
(47°F)		 3°C
(37°F)		 0°C
(32°F)
Minimum -7°C
(20°F)		 -6°C
(22°F)		 -7°C
(20°F)		 1°C
(34°F)		 7°C
(46°F)		 11°C
(53°F)		 16°C
(61°F)		 15°C
(59°F)		 9°C
(49°F)		 6°C
(44°F)		 1°C
(34°F)		 -1°C
(30°F)

Compare climate in Koper with other places

Compare temperature, precipitation, sunshine, UV index in Koper, Slovenia with other places around the world.

Monthly average precipitation in Koper, Slovenia §

Koper usually has the most precipitation in September, November and December, with an average of 11 rainy days and 163 mm (6.4 inches) of precipitation per month.The driest months in Koper are January, July and August. On average, 64 mm (2.5 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Koper, Slovenia.Generated using Copernicus Climate Change Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Average precipitation mm (inches) 56 (2.2) 118 (4.6) 71 (2.8) 103 (4.0) 142 (5.6) 87 (3.4) 65 (2.6) 70 (2.7) 164 (6.4) 107 (4.2) 176 (6.9) 150 (5.9)
Average precipitation days (≥ 1 mm) 7 10 8 10 17 8 8 7 10 10 12 12

Monthly sunshine hours in Koper, Slovenia §

The sunniest months in Koper are June, July and August, when the sun shines an average of 13 hours 31 minutes a day.Least sunny months in Koper: January, February and December receive an average of 6 hours 43 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Koper, Slovenia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2017 to January 2022.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
Mean monthly sunshine hours 181 223 314 344 371 417 429 396 325 292 228 206
Mean daily daylight hours 9h 8m 10h 22m 11h 56m 13h 32m 14h 55m 15h 37m 15h 15m 14h 1m 12h 29m 10h 53m 9h 28m 8h 44m

Solar UV radiation in Koper, Slovenia §

Koper experiences the highest level of ultraviolet (UV) radiation in June, July and August, when the maximum UV index can reach values of 8 - 9, which corresponds to the Very High category of sun exposure.January, February and December are in the Low / Moderate exposure category. In these months, the maximum values of the UV index do not exceed 3. For more detailed information, check out our hourly Koper UV Index data.

Average daily maximum UV levels by month for Koper, Slovenia.Generated using Copernicus Atmosphere Monitoring Service information.Data for period from January 2022 to January 2023.
  Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
UV Index (month maximum) 2 3 5 6 8 9 9 8 7 5 3 2